Paper: Confidence Measure for Word Alignment

ACL ID P09-1105
Title Confidence Measure for Word Alignment
Venue Annual Meeting of the Association of Computational Linguistics
Session Main Conference
Year 2009
  • Fei Huang (IBM T.J. Watson Research Center, Yorktown Heights NY)

In this paper we present a confidence mea- sure for word alignment based on the posterior probability of alignment links. We introduce sentence alignment confi- dence measure and alignment link con- fidence measure. Based on these mea- sures, we improve the alignment qual- ity by selecting high confidence sentence alignments and alignment links from mul- tiple word alignments of the same sen- tence pair. Additionally, we remove low confidence alignment links from the word alignment of a bilingual training corpus, which increases the alignment F-score, improves Chinese-English and Arabic-English translation quality and sig- nificantly reduces the phrase translation table size.